Corsets strive to create the 'golden' 0.7 waist-to-hip ratio that's socially deemed as a desirable trait in women in terms of attractiveness. A lot of clothing styles have a similar aim, albeit more subtle. I guess it's about symmetry/balance.
I was fortunate enough to have been born with pretty wide pelvic bones (34" around at the iliac crest), & a thin, lanky frame (& with that perceived blessing came the curse of
hip dysplasia, so it ain't all it's cracked up to be). I already have the 0.7 hip/waist ratio naturally (37" - 25.5" by the above measuring guide). I don't really feel like I need to emphasize this much further, unless it was for a costume, or something. I'd just look cartoonish if I exaggerated my shape every day. Even if my proportions didn't align with the 'ideal' shape, I would prefer to strive for an overall healthy body, vs subject it to constant compression in an attempt to alter it for the sole purpose of attractiveness.
I have worn corsets for costumes, & when they're fitted well, they can be comfortable (a particularly well-fitted one I once had actually doubled as a spare back brace for me when I fractured my T7), but most are not going to be a custom fit. Most will mess with breathing, possibly blood circulation. They generally look & feel like crap. Compress one place only to have weird unnatural bulges someplace else, etc. You'll overheat easily from a combination of tight, usually nonbreathable material, & diminished lung capacity. No thx.
Corset-training as an everyday lifestyle choice is well established as unhealthy, as it often leads to atrophied core muscles, which can lead to a host of injuries throughout life. Muscle strains, disc herniations, abdominal hernia, etc. Floating ribs are at inscreased risk of fracture or perforating the peritoneum. Organs often shift upward in similar fashion to that of a pregnant woman. I'm sure many pregnant women can attest to a variety of digestive discomforts at their heaviest point, among other things.
The damage occurs over a number of years, so it's likely any success stories you'll see online for corset training will not have a long enough track record to expose the damage, or they otherwise may not be aware of it yet. There's always the chance for general bias, or ulterior motives like selling a specific product, as well.
Wear as a costume? Sure. Daily - it's not safe, practical, or even necessary. Love your shape, whatever it is, & strive to be as healthy as you can. That's beautiful.
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